Bael & Dagon

Bael & Dagon are types of large, toad-like ice demons which Nero and Dante encounter in Fortuna Castle Devil May Cry 4. They are capable of shrouding their toad body in a certain gas which renders them invisible, and they possess two angler fish-like glowing feelers known as Rusalka which resemble young, nubile women, and can speak. These are used to entice human prey, but they can also defend and freeze the prey themselves. However, the demon has a highly vulnerable tongue, and though invisible, a potent stench. The Bael variant is colored white and has blue Rusalka, while the Dagon variant is colored green and has red Rusalka.

Some time before the start of the game, a Bael emerges from the Fortuna Castle Hellgate in the Central Courtyard, and its influence shrouds the castle in a blizzard. Nero first encounters a its Rusalka's and recognizes them as demons, and after fighting them for a short while, the Bael appears. Nero manages to defeat the Bael and rip off one of its Rusalka's, which his Devil Bringer absorbs. The dying Bael threatens that his brothers will come, and Nero soon sees six Dagon's about to emerge from the gate. However, he is able to rush to the gate and deactivate it in time.

Later, a Dagon emerges from the gate, and freezes much of the castle in ice. Dante also encounters its Rusalka's in the Central Courtyard, where he flirts with them, but he too notices the actual demon, insulting it by crediting this to its stink. He fights and defeats the demon, splicing it in two as it turns to ice and shatters. He then takes the Pandora which was powering the Hellgate, and uses it to slaughter the escaped Dagon's and destroy the Hellgate.

Trivia
The Bael which Nero encounters seems to be the only one in its family, as all of its brothers are Dagons.